Types of Transmitters in Measurements
There are many different types of Transmitters which includes:
1). Pressure Transmitters
2). Temperature Transmitters
3). Flow Transmitters
4). Level Transmitters
5). Humidity Transmitters
6). pH and Conductivity Transmitters
7). Vibration Transmitters
8). Position Transmitters
9). Smart Transmitters
10). Wireless Transmitters
1). Pressure Transmitters
Purpose
Measure pressure & convert it into an electrical signal.
Types
- Gauge Pressure Transmitters (measure relative to atmospheric pressure).
- Absolute Pressure Transmitters (measure pressure relative to a vacuum).
- Differential Pressure Transmitters (measure the difference between two pressures).
Applications
Process industries, HVAC systems, and boilers.
2). Temperature Transmitters
Purpose
Convert temperature readings into a standardized electrical signals.
Types
- Resistance Temperature Detector (RTD) Transmitters.
- Thermocouple Transmitters.
Applications
- Food processing,
- Chemical plants, &
- Thermal power stations.
3). Flow Transmitters
Purpose
Measure fluid flow & convert it into an electrical signal.
Types
- Electromagnetic Flow Transmitters.
- Ultrasonic Flow Transmitters.
- Coriolis Flow Transmitters.
Applications
- Water treatment,
- Oil and gas, &
- Chemical industries.
4). Level Transmitters
Purpose
Measure the level of liquids or solids in tanks or silos.
Types
- Capacitance Level Transmitters.
- Radar Level Transmitters.
- Ultrasonic Level Transmitters.
Applications
- Storage tanks,
- Wastewater plants, &
- Process industries.
5). Humidity Transmitters
Purpose
Measure relative humidity (or) dew point.
Types
- Capacitive Humidity Transmitters.
- Resistive Humidity Transmitters.
Applications
- Food storage,
- HVAC systems, &
- Pharmaceutical industries.
6). pH and Conductivity Transmitters
Purpose
Measure the pH level (or) conductivity of a solution.
Applications
- Water treatment plants,
- Chemical processes, &
- Laboratories.
7). Vibration Transmitters
Purpose
Measure the vibration of machinery & equipment.
Applications
- Predictive maintenance,
- Motors, and
- Turbines.
8). Position Transmitters
Purpose
Measure the position of an object, such as a valve (or) actuator.
Applications
- Industrial automation &
- Robotics.
9). Smart Transmitters
Purpose
Combine measurement & advanced diagnostics using digital protocols (e.g., Foundation Fieldbus, HART, Profibus).
Applications
- Modern process control systems &
- IoT-enabled setups.
10). Wireless Transmitters
Purpose
Transmit signals wirelessly, reducing cabling and installation costs.
Applications
- Remote monitoring and
- IoT applications.
Output Signal Types for Transmitters
1). Analog Signals
Voltage: 0-10 V, 1-5 V.
Current: 4-20 mA (most common).
2). Digital Signals
Protocols like
- HART,
- Modbus,
- Profibus.
Conclusion
Transmitters are vital for measurement and control in industries. Their type is selected based on the specific parameter being measured, the environmental conditions, and the control system requirements.